CN111122937A - Current detection method and current detection structure - Google Patents

Current detection method and current detection structure Download PDF

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Publication number
CN111122937A
CN111122937A CN201910923225.7A CN201910923225A CN111122937A CN 111122937 A CN111122937 A CN 111122937A CN 201910923225 A CN201910923225 A CN 201910923225A CN 111122937 A CN111122937 A CN 111122937A
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China
Prior art keywords
bus bar
adjacent bus
measured
adjacent
current detection
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Withdrawn
Application number
CN201910923225.7A
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Chinese (zh)
Inventor
大野千寻
杉山洋贵
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Yazaki Corp
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Yazaki Corp
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Publication of CN111122937A publication Critical patent/CN111122937A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/207—Constructional details independent of the type of device used
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

A current sensing structure comprising: a bus bar to be measured through which a current to be measured flows; an element that detects a magnetic field; and a first adjacent bus bar and a second adjacent bus bar, wherein the arrangement of the first adjacent bus bar and the second adjacent bus bar with respect to the element and the direction and magnitude of the current flowing through the first adjacent bus bar and the second adjacent bus bar are set such that the magnitudes of the magnetic fields generated by the first adjacent bus bar and the second adjacent bus bar at the position of the element are the same and the directions thereof are opposite.

Description

Current detection method and current detection structure
Technical Field
The present invention relates to a current detection method and a current detection structure.
Background
A current sensor that detects a current by a magnetic detection element is known (for example, see patent documents 1 and 2). In addition, patent document 3 discloses a magnetic field measuring apparatus in which an output conductor and a return conductor for passing a current signal are arranged so as to cancel a magnetic field generated by the conductor and sensed by a magnetic sensor.
Documents of the prior art
Patent document
Patent document 1: JP-UM-A-5-25369
Patent document 2: JP-A-2002-243766
Patent document 3: JP-A-2005-134343
Disclosure of Invention
Problems to be solved by the invention
In patent document 1, a magnetic field originating from a current adjacent to a bus bar is shielded by a shield, and an element placed in a gap of the shield detects only the magnetic field originating from the bus bar current to be measured. However, in patent document 1, the shield is large, resulting in an increase in cost.
In patent document 2, two magnetic sensors are arranged so that the absolute values of the outputs of the detection currents are the same and the polarities of the outputs are opposite, and the influence of a uniform external magnetic field is eliminated by detecting the output difference between the two elements. However, in patent document 2, only a uniform external magnetic field can be canceled out, and fluctuations in the external magnetic field cannot be dealt with.
The technique described in patent document 3 aims to reduce display errors in the azimuth sensor by suppressing a magnetic field generated by a current in the portable device and preventing induction of the geomagnetic sensor.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a current detection method and a current detection structure capable of eliminating the influence of an external magnetic field without using a shield and detecting only a magnetic field generated by a current flowing through a bus bar to be measured even when the external magnetic field fluctuates.
Means for solving the problems
In order to achieve the above object, the current detection method and the current detection structure according to the present invention are characterized by the following (1) to (6).
(1) A current sensing method, comprising:
a current detection method using a current detection structure, the current detection structure comprising:
at least one element that detects a magnetic field generated by a current of a bus bar to be measured; and
a first adjacent bus bar and a second adjacent bus bar that are arranged at positions where the bus bar to be measured is interposed between the first adjacent bus bar and the second adjacent bus bar and the first adjacent bus bar and the second adjacent bus bar face each other,
the current detection method comprises the following steps:
the arrangement of the first and second adjacent bus bars relative to the element and the direction and magnitude of the current flowing through the first and second adjacent bus bars are set such that the magnitude of the magnetic fields generated by the first and second adjacent bus bars at the location of the element are the same and opposite in direction.
(2) According to the current detection method of the above (1),
wherein the first adjacent bus bar is integral with the second adjacent bus bar.
(3) According to the current detection method of the above (1) or (2),
wherein the members are arranged at positions where the bus bars to be measured are interposed between the members and the members face each other.
(4) A current sensing structure comprising:
a bus bar to be measured through which a current to be measured flows;
at least one element that detects a magnetic field generated by a current of the bus bar to be measured; and
a first adjacent bus bar and a second adjacent bus bar that are arranged at positions where the bus bar to be measured is interposed between the first adjacent bus bar and the second adjacent bus bar and the first adjacent bus bar and the second adjacent bus bar face each other,
wherein the arrangement of the first and second adjacent bus bars relative to the element and the direction and magnitude of the current flowing through the first and second adjacent bus bars are set such that the magnitude of the magnetic fields generated by the first and second adjacent bus bars at the location of the element are the same and opposite in direction.
(5) According to the current detection structure of the above (4),
wherein the first adjacent bus bar is integral with the second adjacent bus bar.
(6) According to the current detection structure of the above (4) or (5),
wherein the members are arranged at positions where the bus bars to be measured are interposed between the members and the members face each other.
According to the current detection method of the configuration of the above (1), even when the external magnetic field generated by the first adjacent bus bar and the second adjacent bus bar fluctuates, it is possible to eliminate the influence of the external magnetic field without using a shield and to detect only the magnetic field generated by the current flowing through the bus bar to be measured.
According to the current detection method of the configuration of the above (2), the fluctuations in the external magnetic field generated by the first adjacent bus bar and the second adjacent bus bar are the same, so that the influence of the external magnetic field can be eliminated. In addition, the magnitudes of the currents flowing through the first adjacent bus bar and the second adjacent bus bar are always equal, so that the current detection structure can be realized with a simple configuration without requiring a complicated configuration or control for equalizing the current flowing through the first adjacent bus bar and the current flowing through the second adjacent bus bar.
According to the current detection method of the configuration of the above (3), the measurement accuracy is improved by measuring the magnetic field with two elements.
According to the current detection structure of the configuration of the above (4), even when the external magnetic field generated by the first adjacent bus bar and the second adjacent bus bar fluctuates, it is possible to eliminate the influence of the external magnetic field without using a shield and to detect only the magnetic field generated by the current flowing through the bus bar to be measured.
According to the current detection structure of the configuration of the above (5), the fluctuations in the external magnetic field generated by the first adjacent bus bar and the second adjacent bus bar are the same, so that the influence of the external magnetic field can be eliminated. In addition, the magnitudes of the currents flowing through the first adjacent bus bar and the second adjacent bus bar are always equal, so that the current detection structure can be realized with a simple configuration without requiring a complicated configuration or control for equalizing the current flowing through the first adjacent bus bar and the current flowing through the second adjacent bus bar.
According to the current detection structure of the configuration of the above (6), the measurement accuracy is improved by measuring the magnetic field with two elements.
Advantages of the invention
According to the present invention, even when the external magnetic field generated by the first adjacent bus bar and the second adjacent bus bar fluctuates, it is possible to eliminate the influence of the external magnetic field without using a shield and to detect only the magnetic field generated by the current flowing through the bus bar to be measured.
The present invention has been described briefly above. Details of the present invention will be more apparent by reading forms (hereinafter, referred to as "embodiments") for implementing the present invention described below with reference to the accompanying drawings.
Drawings
Fig. 1 is a diagram illustrating a current detection method and a current detection structure according to an embodiment of the present invention.
Fig. 2 is a diagram showing one example of a current detection structure according to an embodiment of the present invention.
Fig. 3 is a diagram illustrating another example of a current detection structure according to an embodiment of the present invention.
Detailed Description
Specific embodiments according to the present invention will be described with reference to the accompanying drawings. Fig. 1 is a diagram illustrating a current detection method and a current detection structure according to an embodiment of the present invention. The current detection structure 1 shown in fig. 1 includes: a bus bar 2 to be measured through which a current to be measured flows; elements 3, 4 for detecting a magnetic field generated around the bus bar 2 to be measured by a current flowing through the bus bar 2 to be measured; and adjacent bus bars 5, 6 (first adjacent bus bar, second adjacent bus bar), the adjacent bus bars 5, 6 being located on opposite sides of a vertical plane extending along a center line in the longitudinal direction (y-axis direction in fig. 1) of the bus bar 2 to be measured (zy-plane in fig. 1). That is, the adjacent bus bars 5, 6 are arranged at positions facing each other with the bus bar 2 to be measured placed therebetween. In the present embodiment, the center line in the longitudinal direction of the bus bar 2 to be measured is parallel to the center line in the longitudinal direction (y-axis in fig. 1) of the adjacent bus bars 5, 6 in the same plane (xy-plane in fig. 1). The elements 3, 4 are arranged such that the magnetosensitive axis is parallel to the arrangement direction (x direction in fig. 1) of the bus bar 2 to be measured and the adjacent bus bars 5, 6, and is perpendicular to the center line in the longitudinal direction of the bus bar. The elements 3, 4 constitute a part of the current sensor and output signals according to the magnitude of the detected magnetic field. In the current detection structure 1, the arrangement of the adjacent bus bar 5 and the adjacent bus bar 6 with respect to the elements 3, 4 and the direction and magnitude of the current flowing through the adjacent bus bar 5 and the adjacent bus bar 6 are set to: so that the magnitude of the magnetic fields generated by the adjacent bus bar 5 and the adjacent bus bar 6 at the location of the elements 3, 4 is the same and the direction of the magnetic fields is opposite. The members 3, 4 are located on opposite sides of a plane that passes through a center line in the longitudinal direction of the bus bar 2 to be measured and is perpendicular to a vertical plane (xy plane in fig. 1) extending along the center line thereof. That is, the members 3, 4 are arranged at such positions as to face each other with the bus bar 2 to be measured interposed therebetween. In the current detection structure 1, the directions of currents flowing through the adjacent bus bars 5, 6 are made opposite to each other, so that even when an external magnetic field generated by the adjacent bus bars 5, 6 fluctuates, the influence of the external magnetic field can be eliminated. Therefore, according to the current detection structure 1, it is possible to eliminate the influence of the external magnetic field without using a shield and detect only the magnetic field generated by the current flowing through the bus bar 2 to be measured.
Specifically, the adjacent bus bars 5, 6 are arranged on both sides of the bus bar 2 to be measured. The current in the adjacent bus bars 5, 6 flows in parallel with the current flowing through the bus bar 2 to be measured. The elements 3, 4 are located respectively above and below the busbar 2 to be measuredAnd (3) side. The distances from the bus bar 2 to be measured to the positions of the elements 3, 4 are exactly the same. The element 3 detects the magnetic field phi generated by the current flowing through the busbar 2 to be measured3And magnetic fields phi respectively generated by currents flowing through the adjacent bus bars 5, 651、φ61. The element 4 detects the magnetic field phi generated by the current flowing through the busbar 2 to be measured4And magnetic fields phi respectively generated by currents flowing through the adjacent bus bars 5, 652、φ62. The magnetic field is measured by means of the two elements 3, 4, thereby improving the measurement accuracy. Adjacent busbars 5, 6 are arranged at the same distance from the elements 3, 4. Currents having the same current value and opposite directions flow through the adjacent bus bars 5, 6. Therefore, the magnetic fields 5a, 6a respectively generated by the currents flowing through the adjacent bus bars 5, 6 cancel out, and the elements 3, 4 are only able to detect the magnetic field generated by the current flowing through the bus bar 2 to be measured. In particular, the element 3 detects the magnetic field φ generated by the current flowing through the busbar 2 to be measured3And a magnetic field phi generated by a current flowing through the adjacent bus bars 5, 651、φ61X-direction component of (phi)51x、φ61x. As shown in equation B1 in 1, the magnetic field φ is equal and opposite in direction51x、φ61xCancel at the location of the element 3, so that only the magnetic field φ generated by the current flowing through the busbar 2 to be measured is detected in the element 33. Similarly, the element 4 detects the magnetic field φ generated by the current flowing through the busbar 2 to be measured4And a magnetic field phi generated by a current flowing through the adjacent bus bars 5, 652、φ62X-direction component of (phi)52x、φ62x。
As shown in equation B2 in 1, the magnetic field φ is equal and opposite in direction52x、φ62xCancel out at the position of the element 4, so that only the magnetic field φ generated by the current flowing through the busbar 2 to be measured is detected in the element 44。
Fig. 2 is a diagram showing one example of a current detection structure according to an embodiment of the present invention. For example, as shown in fig. 2A and 2B, the bus bar 2 to be measured and the adjacent bus bars 5, 6 are integrated and connected to form one current path in the current detection structure 1 shown in fig. 1. Hereinafter, the upstream side and the downstream side of the current flowing through the bus bar 2 to be measured and the adjacent bus bars 5, 6 are simply referred to as the upstream side and the downstream side. In fig. 2A, one end of the downstream side of the bus bar 2 to be measured is connected to one end of the upstream side adjacent to the bus bar 6, and one end of the upstream side adjacent to the bus bar 5 is connected to one end of the downstream side adjacent to the bus bar 6. In addition, in fig. 2B, one end of the downstream side adjacent to the bus bar 5 is connected to one end of the upstream side adjacent to the bus bar 2 to be measured, and one end of the downstream side of the bus bar 2 to be measured is connected to one end of the upstream side adjacent to the bus bar 6 via the U-shaped bus bar. In fig. 2A and 2B, the distances between the adjacent bus bars 5, 6 and the members 3, 4 are the same, the magnitudes of the currents flowing through the adjacent bus bars 5, 6 are the same, and the directions of the currents are opposite.
The bus bar located on the rightmost side in fig. 2B, that is, the portion connecting the bus bar 2 to be measured with the adjacent bus bar 6 and parallel to the bus bar 2 to be measured and the adjacent bus bar 6, is sufficiently spaced from the bus bar 2 to be measured so that the generated magnetic field does not affect the measurement results of the elements 3, 4. The distance between these bus bars and the bus bar 2 to be measured can be set such that the combined magnetic field of the bus bar and the adjacent bus bar 5 and the magnetic field of the adjacent bus bar 6 cancel at the position of the elements 3, 4.
Fig. 3 is a diagram illustrating another example of a current detection structure according to an embodiment of the present invention. In the current detection structure 1 shown in fig. 3, the bus bar 2 to be measured is not connected to the adjacent bus bars 5, 6, and independent current paths are formed. Even in this case, when the distances between the adjacent bus bars 5, 6 and the elements 3, 4 are the same, the magnetic fields generated by the currents flowing through the adjacent bus bars 5, 6 cancel and only the magnetic field generated by the current flowing through the bus bar 2 to be measured is detected in the elements 3, 4, and the magnitudes of the currents flowing through the adjacent bus bars 5, 6 are the same and the directions of the currents are opposite. It is noted that adjacent bus bars 5, 6 may not necessarily be connected to each other.
According to the present embodiment, even when the external magnetic field generated by the adjacent bus bars 5, 6 fluctuates, it is possible to eliminate the influence of the external magnetic field without using a shield and to detect only the magnetic field generated by the current flowing through the bus bar 2 to be measured. In addition, when the adjacent bus bars 5, 6 are connected, the fluctuations of the external magnetic field generated by the adjacent bus bars 5, 6 are the same. Therefore, the influence of the external magnetic field can be eliminated. An example of detecting a magnetic field by two elements 3, 4 has been described in the present embodiment, but one element may be used to detect a magnetic field. Even when there is one element, the arrangement of the adjacent bus bars 5, 6 with respect to the element and the direction and magnitude of the current flowing through the adjacent bus bars 5, 6 are set so that the magnitude of the magnetic fields generated by the adjacent bus bars 5, 6 at the position of the element are the same and opposite in direction. Therefore, it is possible to measure only the magnetic field generated by the current flowing through the bus bar 2 to be measured without using a shield. For example, the current detection method and the current detection structure of the present embodiment are useful as a current sensor that detects a current flowing through a bus bar that connects an on-vehicle battery of an automobile and vehicle electrical components.
Here, features of embodiments of the current detection method and the current detection structure according to the present invention are briefly summarized in [1] to [6] below.
[1] There is provided a current detection method using a current detection structure including:
a bus bar (2) to be measured through which a current to be measured flows (2);
at least one element (3, 4), which at least one element (3, 4) detects a magnetic field generated by the current of the busbar to be measured; and
a first adjacent bus bar (adjacent bus bar 5) and a second adjacent bus bar (adjacent bus bar 6) which are arranged at positions where they face each other with the bus bar to be measured interposed therebetween,
the current detection method comprises the following steps:
the arrangement of the first and second adjacent bus bars with respect to the element and the direction and magnitude of the current flowing through the first and second adjacent bus bars are set such that the magnitude of the magnetic fields generated by the first and second adjacent bus bars at the location of the element are the same and opposite in direction.
[2] In the current detection method according to [1],
the first adjacent bus bar is integral with the second adjacent bus bar.
[3] In the current detection method according to [1] or [2],
the members are arranged at positions where the members face each other with the bus bar to be measured interposed therebetween.
[4] A current detection structure (1) is provided, including:
a bus bar (2) to be measured through which a current to be measured flows (2);
at least one element (3, 4), which at least one element (3, 4) detects a magnetic field generated by the current of the busbar to be measured; and
a first adjacent bus bar (5) and a second adjacent bus bar (6) which are arranged at positions where they face each other with the bus bar to be measured interposed therebetween,
wherein the arrangement of the first and second adjacent bus bars relative to the element and the direction and magnitude of the current flowing through the first and second adjacent bus bars are set such that the magnitude of the magnetic fields generated by the first and second adjacent bus bars at the location of the element are the same and opposite in direction.
[5] In the current detection structure according to [4],
the first adjacent bus bar is integral with the second adjacent bus bar.
[6] In the current detection structure according to [4] or [5],
the members are arranged at positions where they face each other with the bus bar to be measured interposed therebetween.

Claims (6)

1. A current detection method using a current detection structure, the current detection structure comprising:
a bus bar to be measured through which a current to be measured flows;
at least one element that detects a magnetic field generated by a current of the bus bar to be measured; and
a first adjacent bus bar and a second adjacent bus bar, the first adjacent bus bar and the second adjacent bus bar being arranged in: the first adjacent bus bar and the second adjacent bus bar face each other with the bus bar to be measured interposed therebetween,
the current detection method comprises the following steps:
the arrangement of the first and second adjacent bus bars relative to the element and the direction and magnitude of the current flowing through the first and second adjacent bus bars are set such that the magnitude of the magnetic fields generated by the first and second adjacent bus bars at the location of the element are the same and opposite in direction.
2. The current detection method according to claim 1,
wherein the first adjacent bus bar is integral with the second adjacent bus bar.
3. The current detection method according to claim 1 or 2,
wherein the elements are arranged in the following positions: the elements face each other with the bus bar to be measured interposed therebetween.
4. A current sensing structure comprising:
a bus bar to be measured through which a current to be measured flows;
at least one element that detects a magnetic field generated by a current of the bus bar to be measured; and
a first adjacent bus bar and a second adjacent bus bar, the first adjacent bus bar and the second adjacent bus bar being arranged in: the first adjacent bus bar and the second adjacent bus bar face each other with the bus bar to be measured interposed therebetween,
wherein the arrangement of the first and second adjacent bus bars with respect to the element and the direction and magnitude of the current flowing through the first and second adjacent bus bars are set such that the magnitude of the magnetic fields generated by the first and second adjacent bus bars at the location of the element are the same and opposite in direction.
5. The current detection structure according to claim 4,
wherein the first adjacent bus bar is integral with the second adjacent bus bar.
6. The current detection structure according to claim 4 or 5,
wherein the elements are arranged in the following positions: the elements face each other with the bus bar to be measured interposed therebetween.
CN201910923225.7A 2018-10-30 2019-09-27 Current detection method and current detection structure Withdrawn CN111122937A (en)

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JP2018204191A JP2020071100A (en) 2018-10-30 2018-10-30 Current detection method and current detection structure
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111856192A (en) * 2020-07-31 2020-10-30 深圳市德恒科技有限公司 No load check out test set

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002243766A (en) 2001-02-16 2002-08-28 Fuji Electric Co Ltd Electric current sensor
DE10107811A1 (en) * 2001-02-20 2002-09-19 Bosch Gmbh Robert Device, ammeter and motor vehicle
JP2005134343A (en) 2003-10-31 2005-05-26 Asahi Kasei Electronics Co Ltd Apparatus for measuring magnetic field
WO2013005545A1 (en) * 2011-07-05 2013-01-10 アルプス・グリーンデバイス株式会社 Current sensor
WO2014192625A1 (en) * 2013-05-30 2014-12-04 株式会社村田製作所 Current sensor
US10761120B2 (en) * 2017-02-17 2020-09-01 Allegro Microsystems, Llc Current sensor system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111856192A (en) * 2020-07-31 2020-10-30 深圳市德恒科技有限公司 No load check out test set

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US20200132732A1 (en) 2020-04-30
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